Head lamp



w. J. CAMERON HEAD LAMP March 19, 1929.

Filed oct. 19. 1925 A@ vn Patented Mar. 19, 1929.

Price.'

WILL J'. CAMERON, 0F CHICAGO, ILLINOIS. 'l

HEAD LAMP.

Applicatonled October 19,1925. Serial No. 63,371.

My present invention relates to illuminating devices and particularly to a portable lamp that is adapted to be placed upon and supported upo-n the head of a physician, surgeen, dentist or the like for the purpose of illuminating an area or cavity for making an examination and performing operations.

One of the objects of this invention resides in providing a small, but powerful lamp, which may be readily adjusted to divers positions or in dierent angles with respect to the band that encircles the users head, and which is provided with means whereby the light from the bulb may be condensed by means of a suitable lens. In this connection, I have provided simple means whereby the lens may be readily focused, with resspect to the object and bulb, so as toconcentrate upon the particular area the greatest portion of light iiuX emanating from the bulb. Another object resides in providing means whereby a color screen may be interposed between the light source or bulb andthe lens or between the bulb and the area under investigation and in this connection I have-provided a diaphragm element that is rotatably mounted on the instrument, which element is provided with a plurality'of apertures for divers sizes for controlling the light. In designing this ,structure I have hadv foremost in mind the provision of a lamp unit that is extremely compact and to this end secure the terminal socket in the base member by means of the same screw or pin that rpermits the connection of the housing to said base member. Divers other objects will be apparent after an understanding of my invention is had.

I prefer to carry out my invention, and to attain the objects sought in substantially the manner hereinafter fully described and as more particularly Ypointed out in the claim reference being h ere made to the accompanying drawings that form a part ofV this speciiication.

In the drawings Figure 1 is a view in perspective of the head band and the lamp unit that is adjustably connected thereto, the unit being shown in longitudinal elevation.

Figure 2 is a longitudinal or axial section of the lamp unit detached from the head band and drawn to an enlarged scale.

Figure 3 is a transverse section taken on line, 3, 3, of Figure 2 and looking in the direction of the arrows.

Figure 4 is a transverse section on line 4, 4, of Flgure 1, through the head band and illust-rating Athe manner of connecting the lamp unit thereto.

n VThe drawings are in a sense diagrammatic and illustrate a typical or preferred embodilment of my invention, and in the drawings,

so faras practicable, I have employed similar reference characters to designatelike parts `wherever the samel `appear throughout the several views.

As will be seen in Figure 1 of the drawings.I l provide an elongated headband `5 of a suitable width and made of any desired material, the ends of which overlap and pass through a slide 6 that frictionally maintains theends in divers adjusted positions sok that the operator ma adjust Vthe shape of theV band to the size and conformation of his head so that the saine'may be readily placed in position for use.` At about `the center of length of the band 5 it passes through a longitudinal slot in aA plate 7- of rectangular or `other. shape, as

seen in Figure 4, and there is imbedded in this plate, which is preferably made from a moldable material such; as balrelite, an anchor for the spindle of the llight unit. This anchor` consists of a disk 8 that is preferably imbedded `in the plate when the latter is mold- 14 sothat the latter may be rotated in divers directions to provide a universal joint between the anchoring device and the lamp structure. Prior to the spinning operation a small expansion spring 15 is placed within the hollow enlargement 12 that bears against a friction block 16 and presses the latter against a surface of the ball, so that the ball will be maintained in the position into'which it has been adjusted.

A curved arm 17 projects radially from the ball 14 and its outer end is provided with a cylindrically shaped base 18 that is hollow and is provided adjacent the arm 17 with an aperture 19 through whichthe electric conductors are passed into the interior. The conductors are inthe form of a lexiblecable 2O or the like that extends upwardly and is secured to the plate 7 by means of a clip 2l and thence leads loosely in aniarched howto thev clip r slide 6 trom which it extends to a suit able tap or other source of electric supply. Thus there is provided a transverse element that will rest upon the upper portion or top of .the wearers vhead and prevent the yband slipping down in the event zthe latter isadrjusted too loosely. A cup 22 oi ,insulating material is secured in the base 1S by means ora set screw 23 that passes transversely through the wall oi thebase, the end of the screw projects beyond or outside the wall of the base. NVithin this insulating cup there `is placed an vinternallythreaded electric socket 24:into which a miniature electric` bulb is adapted to be screwed. The central or axial terminal of the socket is in the forni Asleeve 28telescopes at itsrear end upon .the base '18 and houses the bulb 25 andsaid sleeve is provided with a bayonet slot- 29 opening into the adjacent endosaid sleeve that co-,acts with the projecting end of set .screw 23, so that said sleeveisprevented from accidental displacement but it may be readily removed rom the base whenever' desired. The

Vouter portion ofthe cylinder is internally threaded as at 30 yto receive the exteriorly threaded tube lthat carries alens 32 at its outer end and said outer end is enlarged and serrated'as at 33 to permit of the ready adkjustment of the lens in the cylinder, so as to 'focus the light -from the bulb 25 upon the object or area it is desired to illuminate. It is frequently desired in making examinations to constrict the light and to this end Iprovide an apertured Adiaphragm 34 that is positioned transversely in a kerf or slot 35 formed in the wall o the sleeve 28adjacent and slightly torward of the end of the bulb or lamp 25. The

-dia ohrao'm is nrovided with a luralit of apertures 36 and in one of said apertures al glass or plain lens SY of What is known as blue daylight-glass is mounted for the purlpose of illuminating actinicrays emanating from .the vfilament of the bulb. lnorder to rotatably mountt-he diaphragm, Secure a .flanged or cupdisk 88 inside the sleeve 28tliat vis centrally provided with an aperture 39 in axialcalinement with the bulb and the lens. The diaphragm 24tis-anchored upon the disk 38 by means of a'headed screw l0 that is positioned eccentric to the axis of the disk so that a lportion of the periphery of the diaphragm 24 Will project `beyond and through the slot in the wall of the cylinder 28, while `the other segment is positioned infront oic the vaperture 39 in dish 38, as seen in Figures 2 and 3, so thatsaid diaphragm may be readily rotated by the operator and thereby position the divers apertures in registry with the aperture39 and the bulb 25. j j

What l claim is f A head-lamp comprising a band, a slide adjustably connecting the ends thereof to pro vide a closed head encircling loop, a plate mounted on said band opposite theslide, a spindle capable of longitudinal adjustment on said plate in a plane transverse to said band7 a lamp carrying member having uni- Versal connection vvvith said spindle, andconductors leading from vsaid member and anchored to said plate and slide With itsintermediate portion providing an arch in a plane J that is transverse to therplane of thevband.

Signed at Chicago, in the county ot`-Cookv1 and State of Illinois, this 15th day ot October,

WILL J. CAMERON. 

